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#

# Pushbutton

# ----------------------------------------------------------------------

# Implements a Motif-like Pushbutton with an optional default ring.

#

# WISH LIST:

#    1)  Allow bitmaps and text on the same button face (Tk limitation).

#    2)  provide arm and disarm bitmaps.

#

# ----------------------------------------------------------------------

#   AUTHOR:  Mark L. Ulferts        EMAIL: mulferts@austin.dsccc.com

#            Bret A. Schuhmacher    EMAIL: bas@wn.com

#

#   @(#) $Id: pushbutton.itk,v 1.1.1.1 2002-01-16 10:24:50 markom Exp $

# ----------------------------------------------------------------------

#            Copyright (c) 1995 DSC Technologies Corporation

# ======================================================================

# Permission to use, copy, modify, distribute and license this software

# and its documentation for any purpose, and without fee or written

# agreement with DSC, is hereby granted, provided that the above copyright

# notice appears in all copies and that both the copyright notice and

# warranty disclaimer below appear in supporting documentation, and that

# the names of DSC Technologies Corporation or DSC Communications

# Corporation not be used in advertising or publicity pertaining to the

# software without specific, written prior permission.

#

# DSC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING

# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NON-

# INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND THE

# AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE,

# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. IN NO EVENT SHALL

# DSC BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR

# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION,

# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

# SOFTWARE.

# ======================================================================

#

# Usual options.

#

itk::usual Pushbutton {

    keep -activebackground -activeforeground -background -borderwidth \

         -cursor -disabledforeground -font -foreground -highlightbackground \

         -highlightcolor -highlightthickness

}

# ------------------------------------------------------------------

#                            PUSHBUTTON

# ------------------------------------------------------------------

class iwidgets::Pushbutton {

    inherit itk::Widget

    constructor {args} {}

    destructor {}

    itk_option define -padx padX Pad 11

    itk_option define -pady padY Pad 4

    itk_option define -font font Font \

            -Adobe-Helvetica-Bold-R-Normal--*-120-*-*-*-*-*-*

    itk_option define -text text Text {}

    itk_option define -bitmap bitmap Bitmap {}

    itk_option define -image image Image {}

    itk_option define -highlightthickness highlightThickness \

            HighlightThickness 2

    itk_option define -borderwidth borderWidth BorderWidth 2

    itk_option define -defaultring defaultRing DefaultRing 0

    itk_option define -defaultringpad defaultRingPad Pad 4

    itk_option define -height height Height 0

    itk_option define -width width Width 0

    itk_option define -takefocus takeFocus TakeFocus 0

    public method flash {}

    public method invoke {}

    protected method _relayout {{when later}}

    protected variable _reposition ""  ;# non-null => _relayout pending

}

#

# Provide a lowercased access method for the Pushbutton class.

#

proc ::iwidgets::pushbutton {pathName args} {

    uplevel ::iwidgets::Pushbutton $pathName $args

}

#

# Use option database to override default resources of base classes.

#

option add *Pushbutton.borderWidth 2 widgetDefault

# ------------------------------------------------------------------

#                        CONSTRUCTOR

# ------------------------------------------------------------------

body iwidgets::Pushbutton::constructor {args} {

    #

    # Reconfigure the hull to act as the outer sunken ring of

    # the pushbutton, complete with focus ring.

    #

    itk_option add hull.borderwidth hull.relief

    itk_option add hull.highlightcolor

    itk_option add hull.highlightbackground

    component hull configure \

            -borderwidth [$this cget -borderwidth]

    pack propagate $itk_component(hull) no

    itk_component add pushbutton {

        button $itk_component(hull).pushbutton \

    } {

        usual

        keep -underline -wraplength -state -command

    }

    pack $itk_component(pushbutton) -expand 1 -fill both

    #

    # Initialize the widget based on the command line options.

    #

    eval itk_initialize $args

    #

    # Layout the pushbutton.

    #

    _relayout

}

# ------------------------------------------------------------------

#                           DESTRUCTOR

# ------------------------------------------------------------------

body iwidgets::Pushbutton::destructor {} {

    if {$_reposition != ""} {after cancel $_reposition}

}

# ------------------------------------------------------------------

#                             OPTIONS

# ------------------------------------------------------------------

# ------------------------------------------------------------------

# OPTION: -padx

#

# Specifies the extra space surrounding the label in the x direction.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::padx {

    $itk_component(pushbutton) configure -padx $itk_option(-padx)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -pady

#

# Specifies the extra space surrounding the label in the y direction.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::pady {

    $itk_component(pushbutton) configure -pady $itk_option(-pady)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -font

#

# Specifies the label font.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::font {

    $itk_component(pushbutton) configure -font $itk_option(-font)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -text

#

# Specifies the label text.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::text {

    $itk_component(pushbutton) configure -text $itk_option(-text)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -bitmap

#

# Specifies the label bitmap.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::bitmap {

    $itk_component(pushbutton) configure -bitmap $itk_option(-bitmap)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -image

#

# Specifies the label image.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::image {

    $itk_component(pushbutton) configure -image $itk_option(-image)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -highlightthickness

#

# Specifies the thickness of the highlight ring.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::highlightthickness {

    $itk_component(pushbutton) configure \

            -highlightthickness $itk_option(-highlightthickness)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -borderwidth

#

# Specifies the width of the relief border.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::borderwidth {

    $itk_component(pushbutton) configure -borderwidth $itk_option(-borderwidth)

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -defaultring

#

# Boolean describing whether the button displays its default ring.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::defaultring {

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -defaultringpad

#

# The size of the padded default ring around the button.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::defaultringpad {

    pack $itk_component(pushbutton) \

            -padx $itk_option(-defaultringpad) \

            -pady $itk_option(-defaultringpad)

}

# ------------------------------------------------------------------

# OPTION: -height

#

# Specifies the height of the button inclusive of any default ring.

# A value of zero lets the push button determine the height based

# on the requested height plus highlightring and defaultringpad.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::height {

    _relayout

}

# ------------------------------------------------------------------

# OPTION: -width

#

# Specifies the width of the button inclusive of any default ring.

# A value of zero lets the push button determine the width based

# on the requested width plus highlightring and defaultringpad.

# ------------------------------------------------------------------

configbody iwidgets::Pushbutton::width {

    _relayout

}

# ------------------------------------------------------------------

#                            METHODS

# ------------------------------------------------------------------

# ------------------------------------------------------------------

# METHOD: flash

#

# Thin wrap of standard button widget flash method.

# ------------------------------------------------------------------

body iwidgets::Pushbutton::flash {} {

    $itk_component(pushbutton) flash

}

# ------------------------------------------------------------------

# METHOD: invoke

#

# Thin wrap of standard button widget invoke method.

# ------------------------------------------------------------------

body iwidgets::Pushbutton::invoke {} {

    $itk_component(pushbutton) invoke

}

# ------------------------------------------------------------------

# PROTECTED METHOD: _relayout ?when?

#

# Adjust the width and height of the Pushbutton to accomadate all the

# current options settings.  Add back in the highlightthickness to

# the button such that the correct reqwidth and reqheight are computed.

# Set the width and height based on the reqwidth/reqheight,

# highlightthickness, and ringpad.  Finally, configure the defaultring

# properly. If "when" is "now", the change is applied immediately.  If

# it is "later" or it is not specified, then the change is applied later,

# when the application is idle.

# ------------------------------------------------------------------

body iwidgets::Pushbutton::_relayout {{when later}} {

    if {$when == "later"} {

        if {$_reposition == ""} {

            set _reposition [after idle [code $this _relayout now]]

        }

        return

    } elseif {$when != "now"} {

        error "bad option \"$when\": should be now or later"

    }

    set _reposition ""

    if {$itk_option(-width) == 0} {

        set w [expr [winfo reqwidth $itk_component(pushbutton)] \

                + 2 * $itk_option(-highlightthickness) \

                + 2 * $itk_option(-borderwidth) \

                + 2 * $itk_option(-defaultringpad)]

    } else {

        set w $itk_option(-width)

    }

    if {$itk_option(-height) == 0} {

        set h [expr [winfo reqheight $itk_component(pushbutton)] \

                + 2 * $itk_option(-highlightthickness) \

                + 2 * $itk_option(-borderwidth) \

                + 2 * $itk_option(-defaultringpad)]

    } else {

        set h $itk_option(-height)

    }

    component hull configure -width $w -height $h

    if {$itk_option(-defaultring)} {

        component hull configure -relief sunken \

                -highlightthickness [$this cget -highlightthickness] \

                -takefocus 1

        configure -takefocus 1

        component pushbutton configure \

                -highlightthickness 0 -takefocus 0

    } else {

        component hull configure -relief flat \

                -highlightthickness 0 -takefocus 0

        component pushbutton configure \

                -highlightthickness [$this cget -highlightthickness] \

                -takefocus 1

        configure -takefocus 0

    }

}